Physics question 1 hw 12 (if you answer please include work!)

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What energy (in eV) is required to remove the remaining electron from a singly ionized helium atom, He+ (Z = 2)?
Question 1 options:
Jul 24th, 2015

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For a He+ ion, we have Z = 2 and n = 1, with a lone electron. The ionisation energy is by definition the minimum energy required to remove the outermost electron, which is given by

E = -Ry*(Z^2/n^2) = -13.6(4) = -54.4 eV. 

Choice 2

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Jul 24th, 2015

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